My goal is to get 25+ mpg from my 99 XJ with 30 x 9.5 R15 ATs - Page 40 - JeepForum.com
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Unread 08-28-2013, 08:08 PM   #586
ECL
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1998 XJ Cherokee 
 
Join Date: Dec 2005
Location: Easton, Pennsylvania
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Another reason for newer cars getting worse mpg's is weight. Those Geo Metros getting 40-50mpg were light. Tough to do today when most new car buyers today want AWD, stiff quiet bodies, crush strength in an accident, lots of airbags, navigation, dual zone climate control, etc, etc....which brings us back to an earlier point - take any unnecessary stuff out of the car. Really no need to ride around on the street with a lot of tools or off-road gear.
I'm guessing a little dieting wouldn't hurt most us either ...lol

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Unread 08-28-2013, 08:43 PM   #587
bobthecatkiller
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I won't dispute that they do weigh more, but I do find it odd, because they have so much more plastic then metal, isn't plastic lighter? lol
I actually need the opposite of dieting I'm down from 175 to 143... Not good anyone want to change metabolisms?
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Unread 08-28-2013, 09:07 PM   #588
JSahara00
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I like simple vehicles and that's why I choose to take my 64 ford galaxie on road trips. I can fix alot of issues it may have with a Phillips head, gets around 20mpgs with the 289 2 barrel setup, and the carbon footprint is long gone by now. I guess I'm recycling. If i could I would drive all old cars but this new infatuation started after my newer cars I already own and have a hard time getting parts for, emissions testing, and replacing bad cats.
Old technology with some modern comforts (heated seats) has made me very happy.

The 95 free Cherokee has also made me happy because it was free.
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00 TJ, OME shocks, all currie control arm, OME steering damper, Brown dog MML, VIAIR OBA with 2 quick disconnects at the doors, jks quick discos, Kolak exhaust, 30 spline D30 w/ ARB and 4:56, 8.8 w/ super 88 and ARB, home made F/R bumpers and tire carrier,OME zj front springs and OME Lj rear springs, CB w/ firestick, DIY highline fenders/hood, 35 pro comp mud terrains, cragar soft 8s .. .

95 XJ 4.0 4x4 Auto, V8 ZJ steering linkage
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Unread 08-28-2013, 10:34 PM   #589
Newtons3
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Quote:
Originally Posted by bobthecatkiller View Post
I get 21-22 mpg hwy yes.
Verified by hand and ultra gauge.
It's not that hard, you act as if the extra pre cats are sooooo bad....
I highly doubt you get 21 city, any thing over 18 (and that's pushing it) city in a stock xj with the i6 is getting a little unrealistic..
I admit I hate the pre cats, I really really do, but as far as I can tell there is not much difference with or without, in terms of mpg.
In fact according to http://www.fueleconomy.gov there's not any difference either. .
I act like they are so bad because in my experience they are. If I could go back, I'd never buy my '06, although that has as much to do with a cantankerous computer and tune as it does the cats.. Id get somewhere around a '99. When looking at Cherokees I generally don't consider the 00 and 01 models. My last '95 did get 18-19 city. My first one got a solid 17 and 20ish highway.
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Unread 08-28-2013, 10:58 PM   #590
bobthecatkiller
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Quote:
Originally Posted by Newtons3

I act like they are so bad because in my experience they are. If I could go back, I'd never buy my '06, although that has as much to do with a cantankerous computer and tune as it does the cats.. Id get somewhere around a '99. When looking at Cherokees I generally don't consider the 00 and 01 models. My last '95 did get 18-19 city. My first one got a solid 17 and 20ish highway.
I get 19 mpg going 30 but never have I ever seen a cherokee with the aw4 and a 4.0 get 18-19 city.
How many hills do you have where you live? Binghamtons not amazingly hilly but I do avg over the rated mpg.... 15-16....
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Unread 08-29-2013, 12:21 AM   #591
Charley3
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Quote:
Originally Posted by Newtons3 View Post
Yep. This has been the subject of much talk. The late 80's early 90's CRX-HF and Civic DX both got 45-55 MPG. My carbureted '83 Toyota got 31-33 MPG. We owned several vehicles that got 40-50. The emissions laws required less scrubbing and promoted better economy. Remember, though, a lot of these vehicles were really down on power. The new combustion chamber designs and DI yield great power but I too am disappointed in the economy. I would think that with the composite materials and potentially lighter chassis we would see 70 mpg or better. I mean, what good is a Smart - really? I don't mind the tiny platform but it is a performance turd and only gets 40 mpg? Not much of an achievement if you ask me.
My parents owned a 79 Mazda station wagon that got 40 mph highway, but is was slightly under powered.

My 97 full size Buick gets 34.6 mpg highway OR lots of power/performance when I step on it.v
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Unread 08-29-2013, 03:14 AM   #592
Charley3
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Quote:
Originally Posted by ninjakid View Post
Was browsing the internet and came across this.
http://www.naxja.org/forum/showthread.php?t=941439



A air dam from a blazer or jimmy is the right size for 96 and under at least (not sure about the later ones with the different bumper) and with some tweaks it'd blend right in I bet.
Extending the air dam has been something I've been wanting to do and this seems pretty easy provided you can find one.
Sun of a gun that's awesome! That right there is an easy solution to my plans to lower my air dam. I'm sure that will gain at least 1 mpg highway! Maybe 2 mpg!

It looks good too! It's prettier than a hot girl!

And costs only $26? It's better than a hot chick!

I'm turned on! I want one! Ahhhh!

Ninjakid, thanks for posting it! It's like economoder porn for XJs! Oh ya!

Tomorrow I am going to begin looking for this air dam to buy one!

===

I didn't get excited at first because I couldn't even see it on my screen. I was like WTF is he talking about? So I ignored and moved on. Later in the night I came back to your post and cranked up my screen brightness. Then I saw it and was WOWED!

Thanks so much for posting this!

===

P.S. - my heart conditon improved today, my gout went away today, and my arthritis greatly improved today. So I am feeling my oats tonight for first time in months! Yehaa!
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Unread 08-29-2013, 03:35 AM   #593
Charley3
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Quote:
Originally Posted by Newtons3 View Post
Yep. This has been the subject of much talk. The late 80's early 90's CRX-HF and Civic DX both got 45-55 MPG. My carbureted '83 Toyota got 31-33 MPG. We owned several vehicles that got 40-50. The emissions laws required less scrubbing and promoted better economy. Remember, though, a lot of these vehicles were really down on power. The new combustion chamber designs and DI yield great power but I too am disappointed in the economy. I would think that with the composite materials and potentially lighter chassis we would see 70 mpg or better. I mean, what good is a Smart - really? I don't mind the tiny platform but it is a performance turd and only gets 40 mpg? Not much of an achievement if you ask me.
My mom's Prius only gets 50 mpg highway in warm/moderate weather. Around 40 mpg if cold weather. It's gas mileage takes a bigger hit from Winter than a fully gas engine does.

I do like the better new all electric cars. My dad owns one. But hybrids are crap.
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Unread 08-29-2013, 04:09 AM   #594
RacerX
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Quote:
Originally Posted by Newtons3 View Post
So....enough 6 month old gasoline to last through the summer stored improperly, not to mention unsafely, in a random used drum? Terrible idea.
NOT exactly what I meant, ...however I expected you could figure out needed cleaning, grounding, insulation, pressure-relief.......

Point: you CAN use winter fuel in summer.
Is it worth the hassle? That probably depends on the people & situation.
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4-wheeling is about going where others can't won't or don't think it's safe.
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Unread 08-29-2013, 04:23 AM   #595
RacerX
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Quote:
Originally Posted by Newtons3 View Post
I have no idea what a fat finger conversion is. I do know that a 335 is 100 mm wider than a 235 and 140 mm taller. Nowhere near the same tire.
..Thought maybe it might mean 'middle finger'? or something like 5-finger discount???

Quote:
Originally Posted by Newtons3 View Post
Has anyone considered heating the fuel, either before the fuel rail or at the injector?
YES I have seen actual patents that actually heat (to a boil, I believe, ... maybe not all).
One I studied looked like a propane fuel system, but with a tank of gasoline vapor. Sounds dangerous, but it had a pretty thick tank.

You can, look up patents through google. Don't remember my search tags other than 100 mpg:
https://www.google.com/?tbm=pts&hl=en

Also this may be similar:
http://peswiki.com/index.php/Directo...or_Fuel_System
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4-wheeling is about going where others can't won't or don't think it's safe.
Freedom. Exploring the wilderness, or nature, whatever... - NOT paying to go on someone's roller-coaster ride, or go-cart track!
"The price of freedom is eternal vigilance." - Thomas Jefferson

Last edited by RacerX; 08-29-2013 at 05:33 AM.. Reason: http://peswiki.com/index.php/Directory:Tom_Ogle's_Vapor_Fuel_System
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Unread 08-29-2013, 04:49 AM   #596
RacerX
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Quote:
Originally Posted by Charley3 View Post
I don't think those honey-comb looking tires will help gas mileage, and they'd clog during mudding. What a mess that would be to clean dried mud from honey-comb holes.

No offense intended, but what do airless honey-comb tires have to do with a gas mileage thread? Seems off topic to me.

I'm more interested in reading about you heating gasoline to (hopefully) make combustion more efficient.
I think #1 is Weight I hear they are mainly plastic - lightweight, flexible
Also weight that has to stop and speed up again
#2 probably a lot more bullet proof ( in pictured application)
#3 looks like there may be less rolling resistance

I do share your concern about the exposed 'honeycomb' - wind resistance?
__________________
4-wheeling is about going where others can't won't or don't think it's safe.
Freedom. Exploring the wilderness, or nature, whatever... - NOT paying to go on someone's roller-coaster ride, or go-cart track!
"The price of freedom is eternal vigilance." - Thomas Jefferson
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Unread 08-29-2013, 05:07 AM   #597
JMH21814
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Quote:
Originally Posted by JMH21814 View Post
From what I've read online about these honeycomb tires is they are extremely difficult to balance, therefore no street tires. Also, if they do become available to the public, then there will be a "skin" on the outside to keep snow, rocks, mud, and whatever else out.
Allow me to repeat myself.
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Unread 08-29-2013, 05:36 AM   #598
RacerX
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Quote:
Originally Posted by JMH21814 View Post
Allow me to repeat myself.
Uh ... I meant no contradiction, ..or offense.

I just wanted to sum up all current points (mine, yours, others)
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4-wheeling is about going where others can't won't or don't think it's safe.
Freedom. Exploring the wilderness, or nature, whatever... - NOT paying to go on someone's roller-coaster ride, or go-cart track!
"The price of freedom is eternal vigilance." - Thomas Jefferson
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Unread 08-29-2013, 06:55 AM   #599
Newtons3
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Quote:
Originally Posted by bobthecatkiller View Post
I get 19 mpg going 30 but never have I ever seen a cherokee with the aw4 and a 4.0 get 18-19 city.
How many hills do you have where you live? Binghamtons not amazingly hilly but I do avg over the rated mpg.... 15-16....
We have 4 hills here, the easements onto the Mississippi River bridges. The whole topography of the Baton Rouge area varies less than 50 ft. I believe. My last 95 was in awesome shape and was not stock, like most of what I own. It got an honest 18-19 around town as long as I didnt hurry. I got 21 every tank driving to work (about 75 percent highway @ 60 mph) and could eke out 22 with the cruise locked on 72 along the I-10 or I-55 corridor.
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Unread 08-29-2013, 07:06 AM   #600
JSahara00
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That sounds like some boring driving. I love hills, you get to see how fast in neutral you can go down the other side.
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00 TJ, OME shocks, all currie control arm, OME steering damper, Brown dog MML, VIAIR OBA with 2 quick disconnects at the doors, jks quick discos, Kolak exhaust, 30 spline D30 w/ ARB and 4:56, 8.8 w/ super 88 and ARB, home made F/R bumpers and tire carrier,OME zj front springs and OME Lj rear springs, CB w/ firestick, DIY highline fenders/hood, 35 pro comp mud terrains, cragar soft 8s .. .

95 XJ 4.0 4x4 Auto, V8 ZJ steering linkage
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